feat: improve error management to avoid infinite loop

The device goes in deep sleep after 3 restarts when connection is not
successful

lib/Transmitter/ITransmitter.h

@@ -2,10 +2,17 @@
 #include <stdint.h>
 #include <stddef.h>
 
+enum class TransmitError : int16_t {
+    OK           =  0,
+    INIT_FAILED  = -1,
+    JOIN_FAILED  = -2,
+    SEND_FAILED  = -3,
+};
+
 class ITransmitter {
 public:
     virtual ~ITransmitter() = default;
-    virtual void init() = 0;
-    virtual void join() = 0;
-    virtual void send(uint8_t* payload, size_t size) = 0;
+    virtual TransmitError init() = 0;
+    virtual TransmitError join() = 0;
+    virtual TransmitError send(uint8_t* payload, size_t size) = 0;
 };